How Much Work Is Done by an Olympic Triathlete Accelerating on Her Bicycle?

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Homework Statement

How much work is done by an Olympic triathlete who accelerates herself on her bicycle (combined mass of 105kg) from 5 m/s to 10 m/s?

Homework Equations

Ek = 1/2mv^2
W = Fapp(d)

The Attempt at a Solution

Ek = 1/2m[(5 + 10)/2]^2

how do i go about solving this?

 

[Nabeshin]

Work is the change in energy of an object. So how much did she start with, and how much did she end up with.

 

[temaire]

Is the answer 3937.5 joules?